Knowledge Bank

Vibration-rotation transitions between the $(010)\mu 2\Sigma -(000)X¯2IIr$ vibronic states, were recorded using far-infrared laser magnetic resonance (FIR-LMR) spectroscopic techniques. These transitions occur near $200cm-1$ for the $(010)\mu 2\Sigma --(000)X~2II1/2$ transition and $160cm-1$ for the $(010)\mu 2\Sigma --(000)X¯2\Pi 3/2$ transition. This is the first direct measurement of the $\nu 2$ band of CCN and with the inclusion of optical data, similar to the one found in the paper by Kohguchi $etal.a$, microwave data from Ohshima and $Endob$, and spin-orbit $datac$ a least squares fit has resulted in an accurate determination of molecular parameters for the ground and the $(010)\mu 2\Sigma -$ states. The data were fit using an $N2$ effective Hamiltonian modified to include the Renner-Teller effect.